Cell C Fiber - 5 days to upgrade without any service - terrible systems

Cell C Fiber, has always, until recently been a service provider I recommended to friends and family. Today, this has changed and I am now in the market for a new ISP.

Last week, I requested to upgrade from a 50/50 line to a 100/100 line and was informed this will be processed Friday or Monday. Today, at lunch time this change was completed(not really) and now I have a 100/100 line that is not active.

The call center, at first told me this should take 30 minutes to an hour for the Service Delivery Manager to action the change request and have the line active, an hour later I called back to be told it will take 5 days to have the line activated as the change over is complete on their side and its with Vumatel.

I called Vumatel, to be told that they have never heard it will take 5 days to have a line made active and that they cannot change my situation. Naturally, no one informed me that I would be without service for 5 days while I await someone to log into their computer and click on the accept change button. Naturally, Cell C will bill me for the 5 Days without service, and no supervisor or manager is available in the call center. I will admit the call center agents were always very kind and pleasant to deal with, even though they are not able to change the status of the line.

Why didn't they do the checks and changes before disconnecting my previous 50/50 line?